Day 25 of my 2025 Favorites: the most festive of boys Phidippus cardinalis. Just a lovely little velvet ant mimic lad. That red is so striking in the sandy scrub. ❤️ #EmotionalSupportSpood #InverteFest Merry Whatever-The-Hell-You're-Doing-Today Day to you all

Not long now! Book your place on my course: Arboreal Harvestmen (recording available after the event if booked/requested). Very excited for this one, we will be talking about legs and the physiology that harvestmen use for their arboreal lifestyle! www.eventbrite.co.uk/e/arboreal-h...

A genome-wide comparison of #gene regulatory sequences & embryonic gene expression in arachnids - new insights into the impact of the arachnopulmonate whole #genome duplication academic.oup.com/gbe/article/... #biodiversity #genomics

Day 26 of my 2025 Favorites: Parenthood be like– When I first catch a glimpse of a giant Hogna wolf mom absolutely covered in babies, my brain refuses to process what I'm seeing, it's just bizarre. And then realization dawns and it's sweet. That's just the invertebrate experience. 🖤 #InverteFest

For the grand finale of our #spider #Advent calendar it's the much anticipated double door to the #nativity scene (for #arachnerds only: yes, we appreciate the hinging issue!)...

A few from last weekend in West Sussex. Walckenaeria cucullata, Centromerus serratus and Cicurina cicur. @britishspiders.bsky.social #spiders #sussex

Thanks to @ajcann.bsky.social for this commentary the new British spider checklist published in our journal Arachnology and available free to our members and via @bioone.bsky.social

Spent some of Sunday looking through the wet collection at BENHS HQ. Most specimens from the late 60s and early 70s in great condition! Their members days offer us to look through specimens and utilise brilliant microscopes @britentsoc.bsky.social #arachnids #harvestmen #entomology #invertebrates

Austracantha minax - the Christmas Jewel Spider These lovely orb-weaver spiders are common at this time of year across large parts of Australia. They are social spiders and so can gather in large numbers making overlapping webs 🕸️ #ausinverts #wildoz #spiders #arachnids #nature #inaturalist

This Christmas spider has been a favourite for a while 🕷 #Christmas #Spider #LoveSpiddrs

I don't have a Christmas tree, but I did illustrate this greeting card years ago, with no awareness of the legend! How am I just learning about it right now?? www.etsy.com/listing/2207...

Under the door for day 23 of our #spider #Advent calendar, it finally time to decorate the #Christmas tree...

Two new species of bird-dropping crab spiders, from the Philippines and Malaysia, are diagnosed, illustrated and described. See more here: doi.org/10.3897/zook... #biodiversity #spiders #taxonomy

Some other gravestone invertebrates from Earlham Cemetery: the spider Diaea dorsata, harvestman Rilaena triangularis, a helomyzid fly (Tephrochlamys flavipes I think) and a globular springtail, Dicyrtomina sp.

Bah, Humbug! Chilly December memories of a warm day in May. Hypsosinga pygmaea. #Arachnids #Spiders #VC55

New postdoctoral fellowship opportunity! Please pass along. Excited to announce the launch of the Tom Lovejoy Fellowship Program at the University of Arizona for innovative research to protect species, sustain ecosystems, and promote a thriving planet lovejoycenter.arizona.edu/lovejoy-fell... 🧪🌐🌾

Day 19 of my 2025 Favorites: Schizomida mom and her cluster of baby clones! I've had many generations of these tiny arachnids from 2 females (they're parthenogenic) collected in a public park near Miami a few years ago, and happened to spot this one with her babies one evening. Delightful lump 🥹

Tonight we're giving a nod to the artistry of #Advent calendars with a tribute to the centuries old history of #spiders in art...

Whether its the wonderful #Sheffield carols or other seasonal musical accompaniment, there's no better way to spend time during the festive season than entering your 2025 #spider and #harvestman data via irecord.org.uk/enter-srs-re... #MakeYourRecordsCount #iRecord

Under door 21 of our #spider #advent calendar, we have some of the less usual indoor winter suspects, hitching lifts in on the #yule logs

The 'door' for day 20 of our #spider #advent calendar, suggests the house guests are changing for the #Christmas festivities to come; it's waiting to be opened....

Yesterday we urged you not to forget the little ones at #Christmas - for today's #arachnid #advent calendar contribution we're going a level smaller....

Ho ho ho! A Christmas Jumper The newest spider to be recorded in Leicestershire and Rutland has got its Christmas jumper on. Learn more: www.naturespot.org/species/phil... (although it was actually recorded in June!) #Arachnids #Spiders #VC55

Under door 18 of our #spider #Advent Calendar, we're featuring some of the little ones, always out, about and active at #Christmas.....

Under door 17 of our #spider #Advent Calendar we're dusting off our #Christmas stockings and checking them for occupants....

Day 26 of our #spider Advent Calendar has a Panto theme, featuring the big, not at all bad, wolf...

Great Record on Sunday, Centromerus serratus this record makes two sites now in West Sussex that ive picked this species up. @britishspiders.bsky.social #spiders #centromerus

Well, there's cephalic modification and there's cephaplic modification, but I've never seen anything as crazy as this outside the #Linyphiidae. #Arachnids #Spiders

Heavy rain kept me indoors today but did give me time to catch up on chores & finish going through yesterday's photos, including another from the park railings, this Platnickina tincta that was prancing about quite happily. #spiders #arachnids

Thursday 11th Dec A fine male Textrix denticulata. Found behind a board leant against a wall at Lambhill Stables. Note the visible spinnerets. #spiders

For day 15 of our #Advent Calendar, we're diversifying from winter #spiders to include #harvestmen #Opiliones....

Time to start adding a bit of sparkle to our #spider #Advent Calendar.....

Oh, you're tired after taking care of your one kid for the entire day?

Under the 13th door of our #spider #Advent Calendar, there's a species not often thought of as winter active:

Half way there - the 12th door of our #spider #Advent Calendar has another winter spider wonder...

Did spiders go soot-black during the Industrial Revolution? 🕷️ Join Geoff Oxford (British Arachnological Society) on Thu, 26 Feb 2026 for a FREE entoLIVE webinar as he revisits claims of industrial melanism in spiders. 🌍 🧪 🔗 www.eventbrite.co.uk/e/1968443417... @britishspiders.bsky.social

For the 11th day of our #spider #Advent Calendar, we bring you a relatively new arrival to Britain that's establishing very fast...

Garden wildlife. 1/2. I managed to find eight Segestria florentinas last night on the house and fence, and all in the usual relatively localised area. There were a couple of places/webs where I didn't see one where I have before, and sadly there were no big ones -

Oligolophus hanseni. #Arachnids #Opiliones #VC55

Hi @britishspiders.bsky.social a couple of questions: * Can you ID this species please? She is directly above our bed keeping watch over her eggs. * How long should it take before we have spiderlings? #UKSpiders #spiders #HouseFauna

'Open' door 9 of our spidery #AdventCalendar to reveal a spider not usually associated with British winters but out and about today...

Xysticus juvenile, likely a ground dwelling species @britishspiders.bsky.social #Arachnids #Spiders

Door 8 of our #spider #AdventCalendar reveals another species present in GB as adults through the year....

Thinking this is Diaea dorsata, which I am sweeping/seeing repeatedly at Allerthorpe Common in East Yorkshire at the moment, so it must be well-established up here now? @ynuorg.bsky.social @yorkswildlife.bsky.social @ecology-digest.bsky.social @britishspiders.bsky.social

Another superb edition of the @britishspiders.bsky.social Newsletter, a member benefit of joining the BAS: britishspiders.org.uk The Newsletter Team is doing a great job! #Arachnids #Spiders

Here is a Youtube video describing our new research. Enjoy! www.youtube.com/watch?v=6rWG...

1/8 A new spider genus from Madagascar! Researchers led by Matjaž Kuntner (National Institute of Biology, Slovenia) have described Osmooka aphana, discovered in the montane forests of Marojejy National Park.

Day 7 of our #spider #AdventCalendar (don't open the door⚠️) brings a winter darkling...

We're wrapping our first Christmas present - time to 'open'⚠️ door 6 of our arachnid #Advent Calendar:

[Originally on Twitter Feb 2022] This thread is about William Rae Sherriffs (7 March 1881 - 7 October 1964) who wrote several papers on the spiders of S India & Sri Lanka. [Photo & bio from Pierre Bonnet's Bibliographia Araneorum, Tome I (1945); English version slightly edited from app output.] 1/n